The solar eclipse stamp image is a photograph taken by astrophysicist Fred Espenak, aka Mr. Eclipse, of Portal, AZ, that shows a total solar eclipse seen from Jalu, Libya, on March 29, 2006.

Thermochromic ink makes the stamp work. Using the heat of your finger, the image will reveal an underlying image of the moon, which Espenak also took. The image reverts back to the eclipse once it cools.

Thermochromic inks are vulnerable to UV light and should be kept out of direct sunlight as much as possible to preserve this special effect. To help ensure longevity, the Postal Service will be offering a special envelope to hold and protect the stamp pane for a nominal fee.

The moon appears to be 14 percent bigger and 30 percent brighter than the average full moon.

The distance between Earth and its moon changes because the moon’s orbit is elliptical. While the average full moon is about 236,790 miles from Earth, Monday’s moon will be 221,525 miles away – a difference of 15,265 miles.

In South Florida the skies were clear for the view, while other parts of the state were cloudy and obstructed the view somewhat. Around the world, photographers captured the unique event and posted their work on social media sites.

After more than nine years in transit, NASA's New Horizons probe is finally ready to fly past Pluto and give us the best glimpse ever of the dwarf planet. And if the last few days leading up to the flyby are any indication, we're about to see some pretty wild stuff.

Up until now, we had no idea what the surface of Pluto actually looks like; the icy dwarf planet is too far away for conventional telescopes to make out clearly. But the increasingly clear pictures New Horizons has been sending back have revealed dark spots and polygonal shapes on Pluto's surface — evidence of complex geology.

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We'll learn more about what Pluto looks like on Tuesday, when New Horizons passes within 8,000 miles of the planet's surface. The probe is scheduled to take a series of observations which should tell us, among other things, the chemical composition of Pluto's surface and atmosphere.

New Horizon's mission doesn't end after Pluto; the spacecraft is slated to study one or two other objects in the Kuiper Belt – the region of small asteroid-like objects surrounding the edge of the solar system.

It will take months for New Horizons to send back all of the data it will gather during its flyby, and the information will probably keep astronomers busy even longer. But if you want to see what the flyby might look like for yourself, you can check out NASA's animated preview app.

This video includes images from NASA, ESA and M. Buie (Southwest Research Institute) and NASA / Johns Hopkins University / Southwest Research Institute.

This latest image from New Horizons allows us to better see the four dark spots on the side of Pluto that always faces...Posted by NASA - National Aeronautics and Space Administration on Saturday, July 11, 2015